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Fast ion conduction character and ionic phase-transition in silver sulfosalts: The case of fettelite [Ag6As2S7][Ag10HgAs2S8]
-
Luca Bindi
and
Silvio Menchetti
Published/Copyright:
April 2, 2015
Abstract
The mineral fettelite, [Ag6As2S7][Ag10HgAs2S8], has been recently structurally characterized. On the whole, the structure can be described as a regular succession of two module layers stacked along the c-axis: a first module layer (labeled A) with composition [Ag6As2S7]2- and a second module layer (labeled B) with composition [Ag10HgAs2S8]2+. Here we report an integrated high-temperature single-crystal X-ray diffraction (HT-SCXRD), differential scanning calorimetry (DSC), and complex impedance spectroscopy (CIS) study on a sample of fettelite from Chañarcillo, Copiapó Province, Chile. DSC and conductivity measurements pointed out that fettelite shows a ionic-transition at about 380 K. HT-SCXRD experiments confirmed the phase transition toward a disordered phase having a trigonal symmetry with the a and b unit-cell parameters halved. In the HT-structure, the disorder is located in the B layer where the Ag-Hg cations are found in various sites corresponding to the most pronounced probability density function locations of diffusion-like paths. This indicates that at least two polytypes could exist for fettelite, the ordered, monoclinic RT-structure (space group C2), and a fast ion conducting, trigonal, disordered HT-form (space group P3̄m1) with a and b parameters halved. The two unit-cell types (corresponding to two different polytypes) could be also found in nature. Slightly different chemical compositions for different fettelite samples (e.g., different Ag/Hg ratios) could play a crucial role as driving forces for different unit-cell stabilizations.
Keywords: Fettelite; HT-data collection; conductivity spectrum; ionic phase transition; fast ionic conductor
Received: 2010-11-8
Accepted: 2010-12-30
Published Online: 2015-4-2
Published in Print: 2011-5-1
© 2015 by Walter de Gruyter Berlin/Boston
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Keywords for this article
Fettelite;
HT-data collection;
conductivity spectrum;
ionic phase transition;
fast ionic conductor
Articles in the same Issue
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- Visualizing trace element distribution in quartz using cathodoluminescence, electron microprobe, and laser ablation-inductively coupled plasma-mass spectrometry
- Krotite, CaAl2O4, a new refractory mineral from the NWA 1934 meteorite
- Translation interface modulation in NC-pyrrhotites: Direct imaging by TEM and a model toward understanding partially disordered structural states
- Crystal chemistry of Ti-rich fluorophlogopite from Presidente Olegario, Alto Paranaíba igneous province, Brazil
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